Projects Document 558-v1

Proposal for Drell-Yan Measurements of Nucleon and Nuclear Structure with the FNAL Main Injector

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Paul E. Reimer
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Paul E. Reimer
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08 Jun 2009, 11:58
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08 Jun 2009, 11:58
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08 Jun 2009, 12:02
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We propose measuring the fractional momentum (x) dependence of the ratio of the anti-down to anti-up quark distributions in the proton [dbar(x)/ubar(x)] using proton induced Drell-Yan reactions at 120 GeV. Recent measurements by FNAL E -866 unexpectedly show considerable x dependence in this ratio for x >0.2. A lower energy primary proton beam from the Main Injector makes it possible to extend the E -866 measurements to larger x with much higher precision The apparatus will also be used with nuclear targets to measure parton energy loss and modifications to anti-quark distributions in nuclear targets at large x (x > 0.2).
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